Lennox 98P78 Hot Surface Ignitor Els PW 17895 Simplifies HVAC troubleshooting by replacing

Simplifies HVAC troubleshooting by replacing chattering or pitted relays

The B-suffix (like this X22440B3B) is designed for external equalizer setups

Technicians should look for physical bulging of the casing or use a multimeter to check if the microfarad reading has dropped more than 5-10% below the rated 5 MFD

serving as a direct White-Rodgers 90-248 cross reference for many OEM parts

If the ac is not turning on despite receiving 24V at the coil

Lennox 98P78 Hot Surface Ignitor Els PW 17895 Simplifies HVAC troubleshooting by replacingThe Lennox 98P78 Hot Surface Ignitor is a critical OEM replacement component designed to ensure consistent glow ignition in residential gas furnaces. Also identified by the part number 98P7801, this 120V silicon carbide igniter is engineered for high temperature durability and rapid thermal response. As a ceramic block style Type B ignitor, it serves as a direct drop in for various Lennox HVAC systems, as well as specific compatible units from Rheem